Liquid crystal cells – elements and systems – Liquid crystal system
Reexamination Certificate
2005-09-06
2005-09-06
Chowdhury, Tarifur R. (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal system
C381S190000
Reexamination Certificate
active
06940564
ABSTRACT:
A display substrate comprising a plate, for example a glass plate, on which display elements, e.g. pixels comprising pixel electrodes and thin-film-transistors, and an acoustic transducer, e.g. a microphone, speaker or buzzer, formed from thin film layers over a cavity, are formed. The cavity may be provided by powderblasting through the depth of the glass plate. The display substrate with integrated acoustic transducer may be incorporated in a display device, e.g. a liquid crystal display device. Also described is a discrete acoustic transducer, comprising a plate of an insulating material, a cavity in the plate, a plurality of layers that have been deposited on the plate, and a moveable member formed from the deposited layers and positioned over the cavity.
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Green Peter W.
Murden Vega
Chowdhury Tarifur R.
Chung David Y.
Koninklijke Philips Electronics , N.V.
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